Refrigeration apparatus



Sept. 15, 1936. sK 2,054,404

REFRIGERATION APPARATUS Filed March 13, 1955 QQ QQQMQQQ Zhwentor Joaga/r Ask/h Gttorneg Patented Sept. 15, 1936 PATENT OFFICE REFRIGERATION APPARATUS Joseph Askin, Buffalo, N. Y., assignor to Fedders Manufacturing Company, Inc., Buffalo, N. Y.

Application March 13, 1935, Serial No. 10,877

2 Claims.

This invention relates to refrigerant evaporation coils which are particularly adapted for use in air conditioning systems.

In modern evaporator practice, it is expedient for proper mass production purposes to form the coils of the unit from tubing of a uniform diameter, thus permitting a tube and fin assembly of a regular character. This practice, however, reduces the thermal efficiency of the unit in systerms where the coils are so disposed as to have different load factors, as other than a uniform feed with this construction has not been obtainable.

In the present invention there is provided a novel manifolding system which permits the utilization of the above mentioned regular construction with the improvement that the effective lengths of the component coils of the unit are varied, to the end that the load factor of each is substantially similar, thus permitting the characteristic uniform feed without inefficiency.

A typical embodiment of the principles of the invention is illustrated in the accompanying.

drawing, wherein:

Fig. l is a side elevation of a cooling unit for an air conditioning system with the input and output headers thereof shown in section.

Figs. 2, 8, and 4 are diagrammatic sectionstaken on the lines 2-2, 33, and 44of Fig. 1.

As shown in the drawing, the cooling unit consists of an upper or feed header ill, a suction header II, and a plurality of interposed cooling coils which are disposed in three vertically disposed rows l2, l3, and ll of horizontal tubes l5 of the same diameter, and connected,as herelnafter described, by loop fittings IS. The tubes "extend through a common set of cross fins l1 and they. are secured thereto.

The unit is connected in the usual refrigerant circuit (not shown) wherein liquid is supplied to the header I0 through a feed conduit l8 under control of a thermostatic expansion valve l9, and, after being permitted to expand in the coils, it is removed from the suction header I I through a suction conduit 20.

The unit is positioned in an air duct D (Fig. 2) with the fins disposed edgewise to the air stream, and, assuming the tube row [2 (Fig. l) to be the, forward row in respect of the air stream, it will be apparent that it will bear the greatest cooling burden, since air velocity and the heat exchange differential progressively per cent, 33 per cent, and 22 per cent respectively, it will be understood that if each row constituted an individual circuit, as is usual in prior art devices, then with a uniform'refrigerant feed from the header ill, a disproportionate supply condition would be set up.

I propose to obtain a correct refrigerant feed by dividing the tube rows into a number of coils or zones proportioned in number to the predetermined load factors. Using the above indicated factors, it will be observed that the rows l2, l3, and I4 bear load factors ofapproximately 4/9, 3/9, and 2/9 respectively. Thus, the row I2 is divided into four individual coils 2|, 22, 23 and 24 (Fig. 2) having input extremities Ha, 22a, 23a, 24a, entering the feed header, and output extremities 21b, 22b, 23b, and 24b, communicating with the suction header II. The second row [3 is provided with three coils or zones (Fig. 3) 25, 26, 21, having input and output extremities 25a, 26a, 21a, and 25b, 26b, and 21b, communicating respectively with the headers Hand l2. The third row l4 (Fig. 4) is formed into two zones or coils 28, 29 having input extremities 28a, 29a, and outlet extremities 28b, 29b similarly connected to the headers.

In operation, since the tubing throughout the unit is preferably of a uniform character, it natu- I ,tenance.

The embodiment which I have described was especially selected because of the relative regularity of the load factors, and it will be understood that in cases where this ideal ratio is not obtainable, the rows may be divided to give a close approximation of the desired ratios, without a noticeable degree of inefiiciency. The invention may also be varied in the precise row disposal and in the number of rows without departing from the inventive concept as set forth in the following claims. a

I claim:

1. In an air cooling system, an air duct, a cooling unit comprising upper and lower headers, a plurality of vertically disposed and similar rows of tubing mounted transversely in said air duct,

each row being connected to form a plm'ality or independent coils, the number of coils in each row being different and in direct ratio to the load factors of the rows and means connecting the coils in parallel to the headers. v

2. In an air cooling system, an air duct, a cooling unit comprising upper and lower headers, a plurality of vertically disposed and similar rows 01' tubing mounted transversely in said air duct,

the tubes in each row being parallel to each other, each row being connected to form a plurality of independent coils, the number of coils in each row being different and in direct ratio to the load factors of the rows, input and output extremities secured to each coil and communicating with the headers.

- JOSEPH ASKIN. 

